Experimentally determined microcracking around a circular hole in a flat plate of bone: comparison with predicted stresses.
Experimentally determined microcracking around a circular hole in a flat plate of bone: comparison with predicted stresses.
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通过实验确定骨平板中圆孔周围的微裂纹：与预测应力的比较。
DOI：
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
D. Barton
中科院分区：
文献类型：
--
作者：
Peter Zioupos;J. Currey;M. S. Mirza;D. Barton
我们检查了牛股骨标本圆孔附近的微裂纹(损伤)。孔附近的应力是通过使用骨骼的弹性常数和屈服应力的有限元分析模型得出的，这些弹性常数和屈服应力是通过一系列专门针对所检查的骨骼类型的力学测试确定的。将微裂纹的空间发生和分布与预测的最大主应力、von Mose应力和应变能量密度函数(所有这些都是由不同的工作者作为骨重建的刺激)的模式进行了比较，并与在混合应力模式下使用两个各向异性屈服准则得出的预测进行了比较。对应力和应变能密度的预测都非常相似，因此不可能声称它们中的任何一个都优于其他。然而，对Hencky-von Mise和Tsai-Wu各向异性屈服准则结果的经验检验表明，Tsai-Wu准则合理地近似了孔周围微裂纹的形态。我们认为，鉴于在应力集中器附近观察到的相当大的损伤，在不规则材料界面(即骨科植入物附近)的类似损伤将需要重新检查有关骨重建的理论，以解释损伤发生的可能性及其程度和可能的影响。在失败前很久，骨骼中就出现了相当大的微损伤，这表明基于损伤的标准比基于应力或应变的标准更有可能成为骨重建行为的成功预测指标。
We examined the microcracking (damage) in the vicinity of a circular hole in bovine femoral bone specimens. The stresses near the hole were derived by a finite element analysis model using the bone's elastic constants and yield stresses, which were determined from a series of mechanical tests specifically for the type of bone under examination. The spatial occurrence and distribution of microcracking was compared to the patterns of the predicted maximum principal stress, the von Mises stress, and the strain energy density function (all implicated by various workers as stimuli for bone remodelling) and to the predictions derived by the use of two engineering criteria for anisotropic yield under mixed mode of stress. The predictions for stresses and the strain energy density were all very similar, making it impossible to claim that any of them is superior to the others. However, empirical examination of the results of the Hencky-von Mises and Tsai-Wu anisotropic yield criteria showed that the Tsai-Wu criterion approximated reasonably the pattern of microcracking around the hole. We suggest that, in the light of the considerable damage observed in the vicinity of stress concentrators, similar damage in irregular material interfaces (i.e. near orthopaedic implants) would require the re-examination of the theories concerning bone remodelling so as to account for the possibility of occurrence of damage and the quantification of its magnitude and likely effect. The presence of considerable microdamage in bone long before it fails suggests that damage-based criteria are more likely to be successful predictors of bone remodelling behaviour than would stress or strain-based criteria.
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影响因子：
4.1
作者：
MORI, S;BURR, DB
通讯作者：
BURR, DB
功能应变和皮质骨适应：骨骼完整性的表观遗传保证。
影响因子：
2.4
作者：
Rubin,CT;McLeod,KJ;Bain,SD
通讯作者：
Bain,SD
有或没有骨内植入物的人类下颌骨的机械模拟。
影响因子：
2.2
作者：
Chen,J;Lu,X;Paydar,N;Akay,HU;Roberts,WE
通讯作者：
Roberts,WE
DOI：
10.1115/1.2895534
发表时间：
1993-11-01
影响因子：
1.7
作者：
HUISKES, R;HOLLISTER, SJ
通讯作者：
HOLLISTER, SJ
影响因子：
2.4
作者：
CARTER, DR;FYHRIE, DP;WHALEN, RT
通讯作者：
WHALEN, RT